Device and method for transmitting common channel message in CDMA communication system

Abstract

A common channel message transmitting device and method in a CDMA communication system. In accordance with the method of the present invention, a mobile station (MS) sends a common channel message with a request for designation of a channel for transmission of a consecutive common channel message, and a base station (BS) sends a response message indicating an available channel ID for use by the MS, when one is available. If a channel ID is available, the MS sends the next message on a channel designated with the assigned channel ID.

What is claimed is:  
     
       1. A common channel message communicating device in a mobile station (MS) of a CDMA communication system, comprising: 
       a channel receiver for receiving a message including a channel ID on a forward common channel;  
       a message generator for generating a reverse common channel message;  
       a message processor for adding a channel designation request to the reverse common channel message and processing the channel ID of the received message;  
       a spreading code generator for generating a spreading code based on the received channel ID; and  
       a channel transmitter for spreading the reverse common channel message by the spreading code and transmitting the spread message.  
     
     
       2. The common channel message communicating device of  claim 1 , wherein the message processor adds the channel designation request to the reverse common channel message for those messages whose length exceeds the capacity for a single transmission. 
     
     
       3. The common channel message communication device of  claim 2 , wherein the adding of a channel designation request to the reverse common channel message by the message processor comprises: 
       loading information indicating the presence of a subsequent message segment as part of a reverse common channel message by the message processor;  
       dividing the reverse common channel message into multiple segments;  
       outputting a message segment including a “more message” indicator for indicating additional message segments; and  
       outputting a channel designation request to the channel transmitter.  
     
     
       4. The common channel message communicating device of  claim 1 , wherein if a designated channel ID is not included in the received message, the message processor assigns a spreading code for a common channel and outputs the spreading code to the spreading code generator. 
     
     
       5. The common channel message communicating device of  claim 1 , wherein the channel ID is included for designating a channel on which the mobile station (MS) can communicate with a base station (BS) without message contention from other mobile stations of the CDMA system. 
     
     
       6. The common channel message communicating device of  claim 5 , wherein the channel ID is a public long code generated with an ESN (Electronic Serial number) of the MS. 
     
     
       7. The common channel message communicating device of  claim 5 , wherein the channel ID is a long code used to designate a channel on which the MS can transmit the message on the reverse common channel. 
     
     
       8. The common channel message communicating device of  claim 1 , wherein: 
       the message processor controls the spreading code of a common channel to be generated for the first message segment; and  
       the message processor controls the spreading code of a designated channel to be generated for a subsequent message segment.  
     
     
       9. A common channel message communicating device in a base station (BS) of a CDMA communication system, comprising: 
       a channel receiver for receiving a message on the reverse common channel;  
       a message generator for generating a message including a designated channel ID, responsive to a channel designation request included with said message, said designated channel ID for assigning a channel spreading code to a reverse common channel message; and  
       a channel transmitter for transmitting the message on the forward common channel.  
     
     
       10. The common channel message communicating device of  claim 9 , wherein the channel ID represents information for designating a channel on which a mobile station (MS) can communicate with the BS. 
     
     
       11. The common channel message communicating device of  claim 10 , wherein the channel ID is a public long code generated with an Electronic Serial Number (ESN) of an MS. 
     
     
       12. The common channel message communicating device of  claim 10 , wherein the channel ID is a long code used to designate a channel on which an MS can transmit the message on the reverse common channel. 
     
     
       13. A common channel message communicating method in a mobile station (MS) of a CDMA communication system, comprising the steps of: 
       (1) generating a reverse common channel message;  
       (2) analyzing the reverse common channel message and sending the reverse common channel message with a channel designation request; and  
       (3) generating a spreading code corresponding to a designated channel ID included in a message received on a forward common channel, spreading a reverse common channel message by the spreading code, and sending the spread message on a designated channel.  
     
     
       14. The common channel message communicating method of  claim 13 , wherein a channel designation is requested at step (2) when the length of the reverse common channel message requires at least two transmissions. 
     
     
       15. The common channel message communicating method of  claim 14 , wherein the message is divided into a plurality of message frames and a message frame is sent with information indicating the presence of a subsequent message frame at step (3). 
     
     
       16. The common channel message communicating method of  claim 15 , wherein if channel ID information is not included in the received message at step (3), a spreading code for a reverse common channel is generated. 
     
     
       17. The common channel message communicating method of  claim 14 , wherein the channel ID represents information for designating a channel on which the MS can communicate with the base station (BS) without message contention from other mobile stations. 
     
     
       18. The common channel message communicating method of  claim 17 , wherein the channel ID represents use of a public long code generated with an electronic serial number (ESN) of the MS. 
     
     
       19. The common channel message communicating method of  claim 17 , wherein the channel ID is a long code used to designate a channel on which the MS can transmit the message on the reverse common channel. 
     
     
       20. The common channel message communicating method of  claim 13 , wherein the channel designation request is added to a first reverse common channel message, and the resulting message is spread by a spreading code for a reverse common channel for transmission, at step (3). 
     
     
       21. A common channel message communicating method in a base station (BS) of a CDMA communication system, comprising the steps of: 
       receiving a message on a reverse common channel;  
       generating a message including a channel ID for designating a channel in which a mobile station (MS) can send the reverse common channel message, if the received message has a channel designation request; and  
       transmitting the generated message on a forward common channel.  
     
     
       22. The common channel message communicating method of  claim 21 , wherein the channel ID is information for designating a channel on which the MS can communicate with the BS thereby preventing message contention with other mobile stations. 
     
     
       23. The common channel message communicating method of  claim 22 , wherein the channel ID is a public long code generated with the electronic serial number (ESN) of the MS. 
     
     
       24. The common channel message communicating method of  claim 22 , wherein the channel ID is a long code used to designate a channel on which the MS can transmit the message on the reverse common channel thereby preventing message contention with other mobile stations.